Add content for C#

* Update 103-csharp.md

* Fix broken link for resource

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/101-backend/content/103-learn-a-language/103-csharp.md

@@ -1 +1,8 @@
-# Csharp
+# Csharp
+C# (pronounced "C sharp") is a general purpose programming language made by Microsoft. It is used to perform different tasks and can be used to create web apps, games, mobile apps, etc.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='purple' badgeText='Learn' href='https://docs.microsoft.com/en-us/learn/paths/csharp-first-steps/?WT.mc_id=dotnet-35129-website'>C# Learning Path</BadgeLink>
+<BadgeLink colorScheme='purple' badgeText='Learn' href='https://www.w3schools.com/cs/index.php'>C# on W3 schools</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://docs.microsoft.com/en-us/shows/CSharp-101/?WT.mc_id=Educationalcsharp-c9-scottha'>Introduction to C#</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=gfkTfcpWqAY&list=PLTjRvDozrdlz3_FPXwb6lX_HoGXa09Yef'>C# tutorials</BadgeLink>